Spray guns



March 18,1958 @.w. BAUR 2,827,330

SPRAY GUNS Filed Feb. l5, 195] 3 Sheets-Sheet l "i- 9 Z4- Z5 Z3 Zgz enfer'.

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March 18, 1958 J. w. BAUR 2,327,330

SPRAY GUNS y Filed Feb. l5. 1951 3 Sheets-Sheet 2 March 18, 195,8 J. w. BAUR I 2,827,330

' SPRAY GUNS 5 Sheets-Sheet 3 Filed Feb. l5, 1951 atet f* 2,827,330 Patented Mar. 18, 1958 pmt- SPRAY GUNS .lohn W. Baur, Glenview, Ill., assignor to Binks Manufacturing Company, Chicago, Ill., a corporation of Deiaware Application February 15, 1951, Seriai No. 211,129

S Claims. (Cl. 299-37) The present invention is regarded as an improvement on spray gun structures generally of the sort shown in U. S. Patent No. 2,249,771, granted July 22, 1941, to William lviacMartin for a Nozzle Structure for Spray Guns.

Among the objects of the invention is to provide a novel spray gun means, particularly the nozzle or head portion thereof, whereby the coating material may be atcmiled or the like as by steam, air, or other fluid, which is heated, etc., at the head or like portion of the gun.

Another object of the invention is to so insulate the head or the like of the spray gun from the handle or remainder of the spray gun to maintain the handle comfortabie to handle and to conserve the eat and to supply it efficiently to the material to be sprayed or the like.

object of the invention is to provide an adjustable control, such as an adjustable valve, for the control of the heat containing or bearing fluid, such as Steam.

A still further object is to provide for keeping the ternperature of the gun and the duct, as a hose, for conducting the heated fluid, such as steam, at a high enough temperature to avoid condensing or condensation of such fluid, as when the gun is not spraying, etc., to avoid or prevent the spoiling of the coating effect by the condensed or iike timid acting on the material being sprayed on the work.

'Other objects, advantages, capabilities, features, and like are comprehended by the invention as will later appear and as are inherently possessed by the invention.

Referring briefly to the drawings:

Fig. l is a side view in elevation of a spray gun ernbodying the invention;

Fig. 2 is a side view of a detail or part of the nozzle portion of the gun;

Fig. 3 is an end view of the means shown in Fig. 2;

Fig. 4 is an end View of the other end (from that shown in Fig. 3) of the means shown in Fig. 2;

Fig. 5 is a longitudinal sectional view of the spray gun embodying the invention and taken in a vertical plane cutting through the gun as shown in Fig. l of the drawings;

Fig. 6 is a longitudinal sectional view on an enlarged scale of the forward portion of the gun structure;

Fig. 7 is a sectional View, on an enlarged scale, and as taker. in a horizontal plane represented by line 7--7 in Fig. l of the drawings;

Fig. S is a transverse sectional view, as taken in a ane represented by line 8 8 shown in Figs. l and 6 drawings; and, ig. 9 is a transverse sectional view, as taken in a plane represented vby line 9-9 shown in Figs. l and 6 of the drawings.

Referring now more in detail to the drawings, the spray gun is shown as having a body 1li having a handle portion 11 by which the operator holds and operates the gun.

A rurdeer Lina;

The body portion 16 of the gun has a portion 12, which may be of a more or less cylindric form and connected to or formed as a rigid part of the upper end portion of the handle part 11 (see Fig. l). At the upper portion of the gun, as the body 1) thereof, is a hook 13 by which the gun may be suspended or supported when desired.

At the upper portion of the gun and at the sides of the gun is pivotally or rotatably supported a trigger or like member 14 which has a depending finger engaging part 15 disposed forwardly of the handle 11 (see Figs. 1 and 5). The upper end portion of the trigger member 14 has a yoke or the like 16 with a leg at each side of the gun and which is pivotally or rotatably supported from a pivot or like member 17 (see Fig. 5) at the upper ends of the yoke 16 and in the upper portion of the body iti, such member 17 having suitable end heads or the like 18 for holding the trigger member 14 in operative relation.

At the forward end of the body 10 is provided a body head portion 19 held in place by a tie rod 20 (see Figs. 5, 6) extending back through a duct or channel 21 provided in the upper portion of the gun body 10 (see Figs. 5, 6 in particular), and the forward end portion 22 of the tie rod 2l) may be threaded or otherwise for engagement with the head part 19 and for holding the head part 19 in place at the forward end of the gun body, and at the rear end of the tie rod 20 is a head 23 by which the rod 2% may be attached in place and adjusted and tightened.

Jbetween the ends of the body portion 10 and the l head portion 19, and the head 23, are provided heat intill sulating gaskets or packings or the like 24, 25, to prevent transmission or conduction of heat from the head 19 to the gun body 10, part 12, and handle 11.

rThe head part 19 has a rearwardly extending tail part 26 or the like which extends through the gasket 24 and has a point or line contact 28 with a head part 27 of the gun body behind the gasket 24. This tail part 26 has but a point or line contact 28 with the head part 27 of the gun body 10, by reason of the differences of taper of the tail part 26 and the socket in the head part 27, as may be seen clearly in particular in Fig. 6 of the drawings. This line or point contact minimizes the conduction of heat from the head part 19 to the gun body 10 which at the same time maintain sufficient contact or close relationship between the gun body 10 and the head 19 so as to keep the one in alined relation with the other regardless of the pull on or via the hoses or ducts connected to the head 19 as later disclosed.

The tail part 26 has a rearward threaded portion 29 on which is adjustably fitted a head 3l) having an inner flange 31 associated with a packing head or gland 32 for pressing against a sealing member or gland 33 to more or less compress the member 33 about a slidable material valve rod 34 so as to maintain it sealed or leak proof at that locus. The valve rod 34 has a valve part 35 at its forward end for controlling the projecting of the coating material from the material chamber 36 in the forward portion of the device.

The head 39 may have a head or crown part 37 having holes 38 by which the part 37 is operated to adjust the parts 3l) and 32 along the threaded part 29.

The rear portion of the rod 34 (see Fig. 5) extends back throuugh the yoke 16 of the hand or linger movable trigger member 14 and has a threaded or adjustable connection 39 with a tubular member 49 (see Fig. 5) normally `spring pressed forwardly by a spring 41 carried in a Spring carrying or holding tube 42 threadedly adjustable via threads 43 in the rear portion of a carrier 44 carried in the cylindric part 12 (see Fig. 5) and in senseo i member 111 seats as a whole in the forward socketed' portion of the head 19 as shown in Figs. 5, 6, 7.

The member 111 (see Fig. 2) has a threaded portion 116 adapted to be engaged or screwed to a similarly threaded portion 117 of the head 19 so that the member 111 as a whole is held in place with the seating portions 112-113, and 114-115-115A in seating and sealing relation.

At an intermediate portion, and forwardly the portion 114 or" the member 111, is a tapered seating portion or part 115 for the seating thereon of a front cap or like member 119 having a tapered rear portion 129 seating on the tapered part 118, and the member 111 has a forward seating portion 121 tapered as is the part 118 and adapted to seat and be in sealing contact with a corresponding tapered portion 122 of the member or cap 119.

Between the parts or portion 121, 115, the member 111 has a neck or tubular portion 123 which may be of polygonal or rectangular form and opposite which the front cap member 119 has or forms an annular cham ber 124 which is located between the seat portions 120 and 122 of the front cap member 119 and the seat portions 118 vand 121 of the nozzle part 111.

The forward end portion of the member or head 19 (see Figs. 5, 6 and 7) is threaded to adjustably receive a coupling means or like 125 having a forward neck or skirt portion 126 which extends around the rear portion or" the nozzle cap member 119 and which have opposed grooves in which is an expanding or resilient coupling ring or the like 127 (see Figs. 5, 6, 7) which acts to hold the front cap member 119 seated as shown. There is thus provided an annular space 128 within the cap or coupling member 125 and between the rear end of the member 119 and the forward end of the head part 19. The front end portion of the head part 19 also has annular spaces 129, to clear the part 114 and the like of the member 11 and between the tapered parts 114 and 118 is an annular channel 131 which is open to the annular space 129 (see Figs. 5, 6 7).

Referring again to Fig. 8, the passage 95 has an extension 132 extending upward (see Figs. 7, 8) to a further duct 137 (see Fig. 7) extending through the member or head 19 to an annular chamber 134 (see Figs. 6 and 7) provided in the head or member 19, and which chamber 134 is located opposite the forward part 136 of the threaded part 116 (see Fig. 2) of the part 111, and is in communication with an annular channel or the like 35 provided in the rear portion of the part 114 (see Figs. 2 and 6 and 7) and in communication with the annular groove or channel 136 between the threaded part 116 and the seating part 114.

From the channel or chamber 134, 135, 136 forwardly extend a plurality of ducts or passages 137 which extend through the member 111 to the chamber 124 (see Figs. 6 and 7).

Eetween the end portion 112 (see Fig. Z) and the threaded portion 116, the member 111 has a neck part or portion 135 and an annular channel 139 (see Fig. 6) which is opposite an annular chamber or channel 141) provided in the head or member 19 and opposite the channel 139 to form an annular chamber- 139-140 for receiving steam from the chamber 94 by way of the chamber 11h where the steam passes through the charnber 141?.

The member 111 has a plurality of ducts 141 running longitudinally through the member 111 from the channel or chamber 139--1455 to a chamber' 142 in the front cap or the like 143 of the nozzle head or cap 119 where the front cap or front wall of the head 119 is provided with one or more steam ejecting orifices 144.

Referring again to Fig. 9, to the lower side of the head 19 is connected a duct connector 56 to the threaded lower end 66 of which may be connected a hose or duct for conducting and supplying coating material or paint v6 or the like via a passage 145 leading to a chamber 146 provided in the lower portion of the head or body portion 19 of the gun, and from this chamber 146 runs a duct 147 (see Fig. 9) to a chamber 149 provided in the body 19 of the gun.

The member 111 has a longitudinally extending chamber 36 connected or communicating at its rear end With the material chamber 149 and having at its forward portion a tapered nozzle part 151 leading to a nozzle 152 having `a nozzle orice 153 where or from which the the tluid to be sprayed is ejected and to be acted upon by the steam being ejected by way of the orices or the like 144, the nozzle part 152 located centrally of the steam outlet or orice or oriices 144.

The valve stem or rod 34 extends through the chamber 149 and also, longitudinally of the chamber 36 and has a tapered or like valve part 35 for controlling the passage and projecting of coating material through the orifice or opening 153 in the nozzle member 152.

The front cap or head portion 119 of the nozzle head is provided with oppositely located horns or the like 154, 154 having ducts 155, 155 extending from the steam chamber 124 and leading to side spray jet passages 156, 156, 157, 157 for projecting side jets on the main stream of coating material projected from the orilice 153 of the nozzle 152 and the steam sheathing projected from the steam oritice or orifices 144, so as to shape the stream thus projected :as desired, such as to llatten or the like of the projecting or ejecting coating material.

In operation the steam or other heated fluid passes up through the duct or connector 55 to the chamber 62 (see Fig. 9) and thence by way for the chamber 62 and thence to the chamber 65 (see Fig. 6). Since the Valve 67 is partly open steam will tlow by way of the chamber 94 to the chamber 111B (see Fig. S) and thence to the channel 140 and channel 139, and thence through the ducts 141 (see Figs. 6 and 7) to the chamber 142 and oriiice or orices 144. At the same time steam will ow from the chamber 94 (see Fig. 8) the valve 97 having been opened for the purpose, by way of the passage 95 to passage 132 (see Figs. 6 and 7) to annular chambers 134, 135, 136 and then by way of ducts 137 to the chamber 124 and thence by way of the ducts 155 to the side jet passages 156, 157 of the horns 154.

This is for keeping the gun, especially the forward part or parts of the gun, in heated condition so that no condensation of the steam or like fluid will occur and be splattered on the warm or hot coating sprayed on a surface by the gun and thus prevent or avoid spoiling the coating sprayed by the gun. The gun is for use with such coating material as will form a desired coating or coated surface by or with the presence of heat, which in this case is effected by use of steam or the like.

Thus by so adjusting valve parts, such as valve 67, also valve 96, the prevention of condensation may be maintained, and when it is desired to cause a spraying or coating, a pull by the operator, as by his fingers, on the handle 14-15 will cause a rearward movement of the parts 36, 84, 71 and valve 67 for a free or full ilow of the steam to the chamber 142 and orifice or oriiices 144 via ducts and chambers 140, 139, 141, 142, and 144, and also via 132, 154, 135, 136, 137, 124, 155 to the side ports 156, 157 in the horns 154.

At the same time the rearward movement of the handle or trigger 14-15 will move the shoe 54 rearwardly and hence the member 53 and headed part 52 threaded to the stem 34 and hence open the valve 35 for the passage of coating material in heated condition to be sprayed by the heated uid, as steam issuing from orifice or orices 144 and from side jet orices 156, 157.

While I have herein described and upon the drawings shown an embodiment of the invention, it is to be understood that the invention is not limited thereto but comprehends other constructions, arrangements of parts, de-

assises-e tails, `eatures, andthelikei without deviating'or departing other, inlet means carried by said spray head portion ,fori

connecting said spray head portion to Va source of liquid coating material under pressure, inlet means carried by Ysaid spray head portion on the remote side of said insulating material fromV the body portion for connecting said spray head portion directly to a source of Yheated fluid .exterior of said gun, said spray ,head portion being provided'w'ith a passage vconnecting said coating material inlet means to the spray nozzle part of said `Spray head portion, said spray head portion also being provided with a passage connecting said heated fluid inlet means to the interior of said spray head portion, said passages being in heat interchange relationship in said spray head portion. v Y

2. In a spray gun structure which comprises a` body portion, a handle therefor, a spray head portion for the gun and a spray nozzle part where the coating material handled in the gun is sprayed, the combination therewith of heat insulating material disposed between the body portion of the gun and the spray head portion of the gun, means for securing said body portion and spray head portion together in heat insulated relationship to each other, inlet means `carried by said spray head portion for connecting said spray head portion to a source of liquid coating material under pressure, inlet means carried by said' spray head portion on the remote side of said insulating material from the body portion for connecting said spray head portion directlyV to a source of heated huid exteriorV of `said gun, Vsaid spray head portion being provided with a passage connecting said coating material inlet means to the'` spray nozzle part of said spray head portion, Ysaid spray head portion also being provided with a passage connecting said heated uid inlet means to the interiorof said sprayY head portion, said passages being inheat interchange relationship in said spray head portion Vfrom substantially said respective inlet means to adjacent said spray nozzle part.

3. ln' a spray gun structure which comprises a body l portion, a handle therefor, a spray head portion for the gun and a spray nozzle part where the coating material handled inthe gun is sprayed, the combination therewith of heat insulating material disposed between the body portion ,of the gun and the spray head portion of the gun, means for securing s aid body portion and spray head portion together in heat insulated relationship to each other, Vinlet means carried by said spray head portion for connecting said spray head portionto a source of liquid coating material under pressure, inlet means carried by said spray head portion on the remote side of said insulat-V ing materialfrom the body portion Vfor connecting said spray head portion directly toV a source of heated uid exteriorY of said gun, said spray head portion being provided with a passage connecting said coating material inlet .means to the spray nozzle part of said spray head tothe interior of said spray head'por'tion, said passages being in heat interchange relationship in said spray head portion from substantially said respective inlet means `to adjacentjsaid spray nozzle part, valve means for control-V i ;8` interchange relationship with "said coating material passage.

4; In a spray gun structure' which comprises a ybody portion, a Vhandle therefor, aspray. head portion for the gun yand a spray nozzle part where the coating material handled in the .gun is sprayed, the combination therewith of heat `insulating material disposed between the body portion of the gun and the spray head portion of theV gun, means for securing said body portion and spray head portion together in heat insulated relationship to each other, inlet means carried by said spray head portion for connecting said spray headportion to a source of liquid coating material under pressure, inlet means carried by said spray head portion on the remote side'o said insulating Vmaterial from the body portion for connecting vsaid spray Vhead portion directly to a source of heated uid exterior of said gun, said spray head portion being :provided with a passage connecting said coating material inlet means to the spray nozzle part of said.

tive inlet means to adjacent said spray nozzle part, valve means V'for controlling .the discharge of coating material from said'spray'nozzle part, Valve means for controlling the flow of said heated uid through said spray head passage in heat interchange relationship with said coating material passage and means for simultaneously actuating y said valve means. I Y

V5. ln a spray gun structure which comprises a body portion, a handle therefor, a spray head portion for the gun and aispray nozzle part Where the coating material' handled inthe gun is sprayed, the combination therewith of heat Vinsulating material disposed between the'body portion of the gun and the spray head portion of the gun, means for securing said body portion and spray head portion together in heat insulated relationship to each other, inlet means carried by said spray head portion for connecting said spray head portion to a source of liquid coatingrmaterial under pressure, inlet means carried by said spray head portion on the remote side of said insulating material from the body portion for connecting said spray head portion directlyto a source -of'heated lluid exterior of said gun, Ysaid spray head portion being provided with a passage connecting said coating material inlet means to the spray nozzle part of said spray head portion,Y said spray head portion Valso being provided' with a passage connecting said heated fluid inlet means to the `interior ofV said spray head portion, said passages being in heat interchange relationship in said spray head part and extending'to said chamberga further material ling the discharge of coating material from said spray nozzle part and valve `means for controlling the flow of said heated fluid through said spray head passagein heat j portion from substantially said respective inlet meansV to adjacent said spray nozzle part, valve means for controlling the discharge of coating material from said spray nozzle part, valve means for controlling the llow of said heated fluid through said spray head passage in heat inter- Y change relationship with said coating material passage,

means for simultaneously actuating said valve means, and

means relative to the :coating material, valve means to permit introduction of'heated uid into said heated duid passage independent of said valve actuating means.

. 6. A spray gun structure having a Vbody portion,a

handle for the body portion, ahead part forwardly of Y,

nozzle part, and having a Vspray nozzle Ytip VWhere theV coating material is sprayed, said head part having a material chamber, and a material Ypassagein said head passage extending from said chamber' and extending through said nozzle part and toV said cap part, a motive iiuid passage extending .directly from the jexterior of the 75S gunand into said head partyandto said'nozzle `partand also forwardly to said cap part and also to said nozzle tip, heat insulating means disposed between said head part and said body part of said structure to minimize the loss of heat from said heated motive fluid from said nozzle structure to said body portion of the gun structure.

7. In a steam spray gun, a main body including a handle and a control lever, a spray head, an adapter fitting, means atording interconnecting coating material passages in said fitting and said head through which coating material supplied to said fitting may be fed, means affording interconnecting steam passages in said fitting and said head through which steam supplied to said fitting may flow as a motive uid to elect heating, atomization and discharge of the coating uid as a spray, a needle valve mounted in said tting and connected to said control lever for governing such discharge of coating material, and rigid means made of heat insulating material and disposed between said fitting and said body, screw threaded clamping means acting between said body and said tting and extending through said rigid means to 1,.

cooperate with said rigid means to support said tting on said body in a heat-breaking relationship so as to thereby eiect substantial thermal isolation of said tting and spray head with respect to said main body.

8. In a steam spray gun, a main body including a .1;

handle and a control lever, a spray head, an adapter fitting, means aording interconnecting coating material passages in said tting and said head through which coating material supplied to said iitting may be fed, means aioiding interconnecting steam passages in said tting and said head through which steam supplied to said tting may flow as a motive fluid to eect heating, atomization and discharge of the coating fluid as a spray, a steam control valve mounted on said tting and effective to control the iiow of steam therethrough, a needle valve mounted in said tting and connected to said control "t lever for governing such discharge of coating material,

and spacer means made of heat insulating material and disposed between said body and said itting and screw threaded clamping means connected between said body and said iitting and extended through said spacer means to support said fitting on said body in a heat-breaking relationship so as to thereby effect substantial thermal isolation of said fitting and spray head with `respect to said main body.

References Cited in the file of this patent UNITED STATES PATENTS 1,260,522 De Vilbiss et el Mar. 26, 1918 2,228,226 Downs Ian. 7, 1941 2,287,770 Albertson June 30, 1942 2,530,186 Trimm et al Nov. 14, 1950 2,621,970 Dalrymple Dec. 16, 1952 

